Yes .. I've already googled it.
All that comes up are instructions on how to do it on Unbuntu. It seems that the process might be entirely different (or impossible) on OpenWRT .. as the file(s) I'm supposed to modify don't exist anywhere on the system. That's why I'm here.

Thank you @Ken-Conrad ! I found a really good example of how to use PySerial on instructables that was written for Pi and it worked out well after i changed UART details. Now just to get mysql installed and we good to go! :)